Recovery of vanadium pentoxide from a spent vanadium catalyst with diluted urea solutions

摘要

The spent catalyst,5.0 g,was treated with 50 ml aq.20% urea at 295-320 K for 5-120 min and filtered.The filtrate was analyzed for V(V)and the max.recovered concn.was 0.0195 mol V/l.Temp,was a minor factor and time was significant for the first 30 min.